The Japan Health & Research Institute contributes to the development and utilization of onsen (hot spring) facilities and the management of general health and research centers. To improve and maintain health and vigor, the Institute also carries out research and surveys to promote healthy living, and conducts health check-ups.

* Many famous hot springs are of this type.

Refers to an onsen in which none of the included components reached a defined amount even when the water is over 25°C. This type of onsen does not stimulate your body, and is widely used for various beneficial effects.Effective for: Recovery from fatigue, nerve pain, insomnia, hardening of the arteries, high blood pressure, etc.

* Non-oxidized ferruginous springs that are close to the source are especially good!

There are two types of ferruginous springs: those that contain iron carbonate, and those that contain melanterite. When the spring water first gushes forth from the source it is colorless and transparent, but it turns a dark reddish-brown color when exposed to oxygen, and its effects also grow weaker.Effective for: Anemia, rheumatism, menopausal disorders, hypoplastic uterus, chronic eczema, etc.

* This type of spring is very stimulating, so watch out for overheating and overexposure.

This type of onsen is known for its characteristic odor of hydrogen sulphide, and causes the blood vessels to expand. However, poor ventilation can be dangerous and should be avoided.Effective for: High blood pressure, hardening of the arteries, chronic skin diseases, joint pain, etc.

* To prevent stress on your body from overexposure to hot water, make sure to pour fresh water on your body after bathing.

This type of spring is extremely stimulating, even to the extent that it can permeate your skin. People with sensitive skin should watch out for overexposure. Acidic springs are used to treat chronic skin diseases and other ailments.Effective for: chronic skin diseases, chronic women's diseases, diabetes, athlete's foot, etc.

* Inhale for the most beneficial effects.

Radioactive springs contain miniscule amounts of radioactivity, and are also referred to as radium springs or radon springs. Radiation is absorbed by the skin and respiratory organs. However, there's no need to worry since it leaves your body immediately after bathing.Effective for: High blood pressure, hardening of the arteries, nerve pain, rheumatism, calming stress, gout, etc.